Your overall attitude is a little too dismissive of Nadal. When you have two players of such high caliber, it is too generic to say that one is just clearly better than the other! Match ups, that explain the current dynamic, comes into play when one or the other has a sustained run of wins (or losses). Same goes with Nadal vs Federer; both players are too good to say that one is simply better even though the H2H would favor Nadal as being the better player.
Match ups also work the other way around; when you have a clearly less accomplished player who tends to beat a clearly more accomplished player -- such as Davydenko/Nadal or Santoro/Safin or at one point Simon/Federer or Canas/Federer...
So essentially, the whole 'match-up' argument is way of showing proper respect to a certain player. Nadal's record of accoimplishments certainly affords him of such!
So essentially, you're saying that Djokovic once had a matchup problem with Nadal (hence he was 4 and 14 against him), and now all of a sudden, he is the matchup problem for Nadal. I've yet to see anyone who claims Djokovic is a matchup problem for Nadal rationalize this point. How does someone as talented as Djokovic who holds a matchup advantage against you fall to 4-14 against you? I've seen Mustard attempt by saying that Nadal always had the physical edge against Djokovic, but he failed to rationalize why he wouldn't consider physical fitness an endogenous factor.
I don't think it's dismissive to say that Djokovic has been the better player than Nadal. The recent results certainly bear this out. If you want to argue that somehow, Nadal and Djokovic are equal players at the moment, then be my guest. It's not really an argument that bears much merit at the present.
Matchup advantages come into play when one player has the clear strategic advantage against the other. When one player has a clear tactical edge and an obvious point of attack, then that player has a matchup advantage.
What Nadal does against Federer works perfectly fine against almost every other player on the tour except the very handful (like 3 players) that can handle his topspin to the backhand. Your argument isn't very sound.
Djokovic is a bad match-up for Nadal because he can press Nadal in ways other players cannot. Just like how Nadal can press Federer in ways other players cannot. It's that simple.
Not true. His topspin to the backhand beats most players because his forehand is
better than their backhand. He has more pace and speed than they do. But the majority of players do not struggle to handle it in the same way that Federer does. In fact, very few players do. Federer has a very clear mechanical disadvantage. This goes well beyond having good technique. You could have a great one-handed technique, like Gasquet or Wawrinka, and still get eaten alive by Nadal's forehand.
Guess what, any time you trade forehand to backhand, chances are, you're going to win that point. The vast majority of players on tour (and players in general) have stronger forehands than backhands.
By your same logic, Djokovic attacks Nadal the same way he attack everyone else. He pushes him back, he moves him around, and he beats him pace and depth on his groundstrokes. So Nadal isn't at a matchup disadvantage anymore than the whole tour is at a matchup disadvantage.
The logic that "Djokovic can attack Nadal in ways that others cannot, ergo he is a matchup [dis]advantage" is a nonsensical and illogical one. And I'll show you why: suppose you genetically engineer the perfect tennis player. He's as fast a cheetah, agile as a gazelle, never makes unforced errors, fetches everything, and hits the ball like it's shot out of a cannon. This player would obviously beat everyone on tour senseless. Now, supposed this player beats Nadal. Would it be because this hypothetically perfect player is a 'matchup advantage' against Nadal? No. This hypothetically perfect player is better than Nadal. Of course he can attack Nadal in ways that others cannot. Any player that is superior to the average player can attack Nadal in ways that the average player cannot. A big server can attack Nadal in ways that the average server cannot. A big forehand can attack Nadal in ways an average forehand cannot. A good returner can attack Nadal in ways an average returner cannot.
By the logic that Djokovic can attack Nadal in ways others cannot, you are resigning yourself to saying that
everybody that is above your barometer for 'average' can attack Nadal in ways that others cannot, and therefore holds a matchup advantage. This logic is silly.